JPH07246549A - Tube inner surface polishing device - Google Patents

Abstract

PURPOSE:To polish the tube inner surface efficiently without giving a hurt to the finished surface of the tube inner surface, or crushing in a foreign matter and the like in the unpolished part. CONSTITUTION:In a tube inner surface polishing device which is provided rotatable at the tip of a flexible shaft 16, and has a polishing unit 4 having grinding wheels 6 to polish the tube inner surface, the polishing unit 4 has leaf springs 23 to press the grinding wheels 6 to the tube inner surface, and threads 24 to separate the grinding wheels 6 from the tube inner surface against the pressing force of the leaf springs 23, are provided, and furthermore, blades 12 to exhaust grinding chips generated by the polishing of the tube inner surface, and a polishing solution fed to the tube inner surface, is also provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polishing device for an inner surface of a tube, and in particular, it is generated during the inner surface grinding or polishing (hereinafter, the grinding or polishing is referred to as "polishing") of a bent portion of a small diameter tube. The present invention relates to a tube inner surface polishing apparatus that removes pitting.

[0002]

2. Description of the Related Art Conventionally, a tube inner surface polishing apparatus, for example,
Flexible as a tube inner surface polishing device that polishes the inner surface of the tube bending part that manufactures high-pressure polyethylene, which is the center of the polymer manufacturing facility of a chemical plant, to a mirror surface and removes the pitting of the tube inner surface generated during use. A polishing section having a grindstone was attached to the tip of the shaft, and the straight tube section and the bent section were polished while supplying a polishing solution.

The procedure for polishing the inner surface 57 of a U-shaped tube 56 as shown in FIG. 5 using a conventional tube inner surface polishing apparatus is as follows.

Regarding the straight pipe section 59, # 80 to # 8
Finishing is performed by gradually increasing the number of grindstones by using the straight pipe polishing section up to the required finishing degree of about 00.

Next, with respect to the bent portion 58, a bent portion polishing portion is inserted from the inlet 59a of the straight pipe portion 59, and, similarly to the straight pipe portion 59, finishing of about # 80 to # 800 is performed.

When the polishing part for bending part is inserted,
Since 9 is scratched, the final finishing is repeated from about # 400.

The straight pipe lower portion 60 is finished in the same manner as the procedure 1.

[0008]

However, the above-mentioned prior art has the following problems.

1) Most of the target tubes are U-shaped. In this case, after bending the straight pipe part 59, the bent part 5
8 will be polished. Therefore, when the polishing portion for polishing the bent portion is inserted, the finished inner surface 57 of the straight pipe portion 59 is scratched, and the straight pipe portion 59 needs to be refinished, resulting in poor efficiency.

2) When the bent portion 58 is finished first, there is a problem in that the foreign matter or the like of the straight pipe portion 59 or 60 is bitten into it and the finish cannot be finished neatly.

3) There is a limit to downsizing of the polishing portion, and it was difficult to apply the above-mentioned tube inner surface polishing device when the curvature of the bent portion 58 is small (for example, R200 or less).

The object of the present invention is suitable for polishing the inner surface of the tube, particularly the bent portion of the tube having a small curvature, and does not scratch the already-finished polishing surface, and does not bite foreign matter such as dust in the unpolished portion, and An object of the present invention is to provide a tube inner surface polishing apparatus capable of efficiently polishing the tube inner surface.

[0013]

In order to achieve the above object, the first aspect of the present invention is a tube inner surface polishing apparatus having a polishing portion rotatably provided at the tip of a flexible shaft and having a grindstone for polishing the tube inner surface. In the above, the polishing part has a pressing / reducing means capable of pressing the grindstone against the inner surface of the tube and contracting away from the inner surface of the tube.

According to a second aspect of the present invention, in the first aspect of the present invention, the pressing / reducing means presses the grindstone against the inner surface of the tube by an elastic member, and the tube against the grindstone against the pressing force of the elastic member. It has a means for contracting inwardly away from the inner surface.

According to a third aspect of the present invention, in the first or second aspect of the present invention, the polishing section has a blade for discharging polishing dust generated by polishing the inner surface of the tube of the polishing section and a polishing liquid supplied. Is.

[0016]

According to the present invention, in a tube inner surface polishing apparatus provided with a polishing portion rotatably provided at the tip of a flexible shaft and having a grindstone for polishing the tube inner surface,
This polishing section has a pressing / reducing means capable of pressing the grindstone against the inner surface of the tube and reducing the distance from the inner surface of the tube. It can be moved without contacting the inner surface, and does not scratch the already-polished portion of the inner surface of the tube during movement or entrap foreign matter in the unpolished portion during polishing. Then, in the polishing section that has been moved to a necessary location on the inner surface of the tube, the grindstone presses the inner surface of the tube, so that the inner surface of the tube can be polished by the rotation of the polishing section.

Further, the pressing / reducing means has an elastic member for pressing the grindstone against the inner surface of the tube, and means for contracting the grindstone inwardly away from the inner surface of the tube against the pressing force of the elastic member. Therefore, during polishing, the grinding stone of the polishing section can press and polish the inner surface of the tube by the uniform pressing force of the elastic member. When the polishing part is moved before the start of polishing or after the end of polishing, the grindstone can be shrunk inward, so that the whetstone can be moved without contacting the inner surface of the tube and the operation is simple. Even in the bent portion of the tube having a small inner diameter, the grindstone of the polishing portion can be brought into close contact with the inner surface of the tube for polishing.

Further, since the polishing section has a blade for discharging polishing dust generated by polishing the inner surface of the tube and the supplied polishing liquid, the polishing dust and the supplied polishing liquid are discharged by the rotation of the blade. Therefore, a new polishing liquid is constantly supplied to the grindstone of the polishing section and the inner surface of the tube, so that the inner surface of the tube can be efficiently polished without the inclusion of foreign matter.

[0019]

Embodiments of the tube inner surface polishing apparatus according to the present invention will be described below in detail with reference to the drawings. FIG. 1 shows an embodiment of a polishing section for a tube inner surface polishing apparatus according to the present invention,
(A) is a side view, (B) is a front view, (C) is a top view, FIG. 2 is a diagram for explaining the action of the tube inner surface polishing apparatus polishing section of FIG. 1, and (A) is a side view of step 1. , (B) is a side view of step 2, (C) is a side view of step 3, FIG. 3 is a principle view of the tube inner surface polishing apparatus according to the present invention, and FIG. 4 is a cleaning apparatus for the tube inner surface polishing apparatus according to the present invention. FIG.

FIG. 1 shows a polishing section 4 of a tube inner surface polishing apparatus 1 according to the present invention. The polishing section 4 is rotatably provided at the tip of the flexible shaft 16 and has two grindstones 6 and 6 that contact the inner surface of the tube to press and polish the tube. The grindstones 6 and 6 have a pressing / reducing means capable of pressing the inner surface of the tube and reducing the distance from the inner surface of the tube. That is, the pressing and reducing means are leaf springs 23 and 2 which are elastic members for pressing the grindstones 6 and 6 to the inner surface of the tube.
3 and means for shrinking the grindstones 6 and 6 inward from the inner surface of the tube against the pressing force of the leaf springs 23 and 23, and a connecting jig to which the threads 24 and 24 and the threads 24 and 24 are fixed. 11 and 11.

Further, the polishing section 4 has grindstone pedestals 7 and 7 for holding the grindstones 6 and 6, and a main shaft portion 9 to which leaf springs 23 and 23 are fixed by screws 10, and the grindstone 6 and Reference numeral 6 is one that is attached by being inserted into the grindstone receiving pedestals 7, 7 and has a shortened length in the longitudinal direction of the tube for polishing the bent portion of the tube. The polishing section 4 has blades 12, 12 for discharging the polishing dust generated by polishing the inner surface of the tube of the polishing section 4 and the supplied polishing liquid. The blades 12, 12 are attached to the main shaft portion 9 with screws 13, and are provided at an angle. The connecting jig 11 is a well-known knocking type found in a ballpoint pen or the like having a coil spring and ratchet type teeth inside, and is a type that contracts when pressed and returns to the original by the force of the coil spring when pressed again.

The tube inner surface polishing apparatus 1 of the present invention constructed as described above operates as follows. That is, FIG.
As shown in (A), the polishing section 4 pushes the connecting jig 11 to which the thread 24 is fixed into the tube before being inserted into the main shaft section 9, so that the leaf springs 23, 23 are separated by the thread 24, 24. The grindstones 6, 6 are contracted inward against the force of expanding and pressing the leaf springs 23, 23. By shrinking the polishing portion 4 in this way, as shown in FIG. 6B, insertion can be performed without damaging the polished inner surface of the tube.

When the polishing portion 4 is located at an unpolished portion of the tube, for example, at a bent portion, as shown in FIG. 7C, the flexible portion centered on the center portion of the tube by the centering jig 25 from the opposite side of the tube. The connecting jig 11 is pressed by the pressing rod 26 attached to the tube 27.
By pressing the connecting jig 11, the connecting jig 11 is projected and the threads 24, 24 are loosened, the leaf springs 23, 23 are released, and a force for pressing the grindstones 6, 6 to the inner surface of the tube works.
This allows the grindstones 6, 6 to be pressed against the tube inner surface 57. The strength of the leaf springs 23, 23 can be adjusted by appropriately selecting the size, strength, and the like. In order to shorten the polishing section 4 and reduce the size to a small diameter,
The leaf springs 23, 23 are used according to the inner diameter and the curvature of the tube. The leaf springs 23, 23 can be replaced with a mechanism so that the spring strength can be adjusted to the optimum one for polishing. The grindstones 6, 6 are grindstones having different grain sizes, for example, #
Items 80 to # 1000 are attached to the leaf springs 23 of the polishing section, and are sequentially replaced by the grindstone support 7 which can be attached and detached, and are polished to the required degree of finish.

Since the blade 12 rotates in the same manner as the flexible shaft 16, the blade 12 can efficiently and forcibly push out the polishing liquid and polishing debris in the advancing direction of the polishing section 4 by rotation. A blade 12 attached to the main shaft portion 9 of the polishing portion 4.
Is angled so as to push the polishing liquid forward by rotation, and the diameter of the blade 12 is formed so as not to come into contact with the inner surface 57 of the tube. Further, the material is made of a soft material such as plastic. Since the liquid containing the polishing liquid and the polishing dust can be pushed forward by the rotation, the polishing can be performed without damaging the tube inner surface 57.

When the polishing is completed, the above-described FIG.
As described above, the connecting jig 11 is again pressed by the pressing rod 26 of the centering jig 25 inserted from the end surface on the opposite side of the tube, and the leaf springs 23, 23 are pulled inward by the threads 24, 24. Since 4 is contracted, there is no risk of damaging the tube inner surface 57 after polishing even when the polishing section 4 is removed after polishing.

As described above, the polishing section 4 presses the grindstone 6 against the inner surface 57 of the tube by the force of the leaf spring 23 and grinds it. However, in order to bring the grindstone 6 into contact only with a required polishing portion, the tip of the leaf spring 23 is made of thread or the like. The diameter of the polishing portion 4 is increased by pulling inward to reduce the diameter of the polishing portion 4 or conversely loosening the thread. Therefore, when passing through the polishing end portion, the polishing portion 4 is contracted so as not to contact the inner surface of the tube, and the grindstone can be pressed against the inner surface of the tube only when polishing the portion of the tube where polishing is required. To be achieved.

As a means for retracting the grindstone inward from the inner surface of the tube against the pressing force of the elastic member, the structure of the connecting jig 11 is a key groove type, and when pressed and rotated, it is fixed by the key and groove. When returning to the original state, a method of returning to the original state by pulling by the force of the thread 24 and the leaf spring 23 by pushing or turning to the original may be adopted (not shown). Furthermore,
A tool that uses the attraction force of a magnet may be incorporated into the main shaft portion 9 in and out of the main shaft portion 9 of the connecting jig 11. Further, without using the thread 24, an air cylinder or a moving means by electromagnetic force may be provided as a pressing / reducing means for the grindstone to the inner surface of the tube.

FIG. 3 is a principle view of the tube inner surface polishing apparatus 1 according to the present invention. This tube inner surface polishing apparatus 1 is
Polishing device 3 for polishing the inner surface of the tube, and polishing liquid supply device 30 for supplying the polishing liquid to the grindstone 6 and the inner surface 57 of the tube.
And a polishing liquid recovery device 36 for recovering the supplied polishing liquid,
Visual inspection device 4 for visually inspecting the inner surface of the polished tube
0, and a cleaning device 46 for cleaning the inner surface of the tube after polishing the inner surface of the tube shown in FIG.

In the polishing apparatus 3, the above-mentioned polishing section 4 is inserted into the inner surface of the tube 56, and the flexible shaft 16 and the polishing motor 18 for rotating the polishing section 4 are driven.
And the number of rotations of the feed device 17 of the flexible shaft 16 and the polishing motor 18 for rotating the grindstone 6 of the polishing section, the feed speed of the flexible shaft 16, the feed distance,
The control device 19 controls the number of feeds.

The polishing liquid supply device 30 includes a polishing liquid supply nozzle 32 for injecting the polishing liquid 31 for polishing into the tube 56, a connecting pipe 33 for supplying the polishing liquid to the nozzle 32, and a pump 34. Also, the filter 35 is integrally formed, and the filter 35 is immersed in the polishing liquid 31 in the polishing liquid recovery tank 38. The polishing liquid 31 is supplied from the polishing liquid supply nozzle 32 into the tube 56 by the pump 34, and is discharged from the opening of the tube on the opposite side by the polishing liquid recovery pump 37 of the polishing liquid recovery device 36. The liquid in which the polishing liquid 31 and the polishing dust are mixed is collected in the polishing liquid recovery tank 38, and after the polishing dust is removed by the filter 35 and the magnet (not shown), the pump 34 again supplies the polishing liquid from the polishing liquid supply nozzle 32. It is supplied toward the tube 56.

The visual inspection device 40 is for confirming the degree of polishing of the inner surface 57 of the tube. The direct-view rotary fiberscope 41 has a TV 42 and a VT for visual inspection.
It is connected to R43. Fiberscope 41
The control method and mechanism are the same as those of the flexible shaft 16 which is the drive unit of the polishing apparatus 3 and the feeding apparatus 17 thereof.

FIG. 4 shows a cleaning device 46 for completely removing polishing debris together with a polishing liquid at each step of polishing the tube inner surface 57 to prevent the tube inner surface 57 from being scratched. Is. In this device, the compressed air from the compressor 50 is jetted from the air nozzle 48 toward the sponge 47 via the pipe 49 with a valve,
Abrasive debris in the tube 56 is removed and washed, and the sponge recovery jig 51 receives it.

The control unit 19 of the tube inner surface polishing apparatus 1
May be configured with a control panel (not shown) of the polishing liquid supply device 30 and the polishing liquid recovery device 36, and a control panel integrated together.

One or more of the above-mentioned devices are put together on a carriage, moved to a tube to be polished, set, and then polished. As a result, the inner surface of the tube can be polished without moving the tube.

[0035]

According to the first aspect of the present invention, the polishing section has the pressing / reducing means capable of pressing the grindstone against the inner surface of the tube and capable of contracting away from the inner surface of the tube. There is no risk of scratching the already-polished portion of the inner surface of the tube when inserting or removing the portion, or biting foreign matter in the unpolished portion during polishing when inserting the polishing portion. On the other hand, the polishing portion moved to a portion of the inner surface of the tube where polishing is required spreads so that the grindstone presses the inner surface of the tube, and the inner surface of the tube can be surely polished by rotating the polishing portion.

According to the second aspect of the present invention, in the first aspect of the present invention, the pressing / reducing means includes an elastic member for pressing the grindstone against the inner surface of the tube, and the grindstone from the inner surface of the tube against the pressing force of the elastic member. Since the means for separating and contracting inward is provided, in addition to the effect of the first aspect of the present invention, the inner surface of the tube can be uniformly polished by the uniform pressing force of the elastic member during polishing. When the polishing portion is moved before the polishing is started or after the polishing is completed, the movement can be performed without contacting the inner surface of the tube, and the operation is easy. Further, even a tube having a small inner diameter, particularly a bent portion, can be easily polished.

According to the third invention, the first invention or the second invention
In the invention, the polishing section has the blade for discharging the polishing waste generated by the polishing of the inner surface of the tube and the supplied polishing liquid. Therefore, in addition to the effect of the first invention or the second invention, the polishing portion is rotated by the rotation of the blade. Scrap and the supplied polishing liquid can be discharged, and a new polishing liquid is constantly supplied to the contact surface between the grindstone of the polishing section and the inner surface of the tube. You can do well.

[Brief description of drawings]

FIG. 1 shows an embodiment of a polishing section for a tube inner surface polishing apparatus according to the present invention, in which (A) is a side view and (B) is a front view.
(C) is a top view.

2A and 2B are views for explaining the action of the polishing section of the tube inner surface polishing apparatus of FIG. 1, in which (A) is a side view of step 1, (B) is a side view of step 2, and (C) is a side view of step 3. Is.

FIG. 3 is a principle diagram of a tube inner surface polishing apparatus according to the present invention.

FIG. 4 is a principle view of a cleaning device of the tube inner surface polishing device according to the present invention.

FIG. 5 is a front view of a tube having a straight pipe portion and a bent portion.

[Explanation of symbols]

 1 Tube Inner Surface Polishing Device 4 Polishing Part 6 Grinding Stone 12 Blade 16 Flexible Shaft 23 Leaf Spring (Elastic Member) 24 Thread 31 Polishing Liquid 57 Tube Inner Surface

Claims (3)

[Claims] 1. A tube inner surface polishing apparatus comprising a polishing portion rotatably provided at the tip of a flexible shaft and having a grinding stone for polishing the inner surface of the tube, wherein the polishing portion can press the whetstone against the inner surface of the tube. And a tube inner surface polishing apparatus having a pressing / reducing means capable of contracting away from the inner surface of the tube. 2. The pressing / reducing means according to claim 1, wherein an elastic member that presses the grindstone against the inner surface of the tube, and an inner side that separates the grindstone from the inner surface of the tube against the pressing force of the elastic member. An apparatus for polishing an inner surface of a tube, characterized in that it has a means for shrinking. 3. The tube inner surface polishing according to claim 1, wherein the polishing section has a blade for discharging polishing dust generated by polishing the tube inner surface of the polishing section and a polishing liquid supplied thereto. apparatus.